Ap3. Does the Michigan Business Tax Act (MBTA) provide for "throw back sales"?

The MBTA does not provide for "throw back sales." A "throw back sale"
describes a situation in which the income or activity from a Michigan taxpayer's
sale of tangible personal property to an out-of-state purchaser is not taxable
in the state of the purchaser. The sale would then be "thrown back" to Michigan
by inclusion in the sales apportionment factor' s numerator, and increase the
portion of the tax base subject to the Michigan Business Tax.

Sales to destinations outside Michigan need not be included in the MBT sales
factor numerator regardless of whether nexus exists or tax is paid in the
destination jurisdiction. However, if the taxpayer does not have nexus in at
least one other state, they cannot apportion their tax base, and all business
income, modified gross receipts and net capital tax bases are fully allocated to
Michigan. The direct premiums tax base for insurance companies is not subject to
apportionment.